package com.ruoyi.common.filter;

import java.io.IOException;
import javax.servlet.Filter;
import javax.servlet.FilterChain;
import javax.servlet.FilterConfig;
import javax.servlet.ServletException;
import javax.servlet.ServletRequest;
import javax.servlet.ServletResponse;
import javax.servlet.http.HttpServletRequest;
import org.springframework.http.MediaType;
import com.ruoyi.common.utils.StringUtils;

/**
 * Repeatable 过滤器
 *
 * @author ruoyi
 */
public class RepeatableFilter implements Filter
{
    @Override
    public void init(FilterConfig filterConfig) throws ServletException
    {

    }

    @Override
    public void doFilter(ServletRequest request, ServletResponse response, FilterChain chain)
            throws IOException, ServletException
    {
        ServletRequest requestWrapper = null;

        // 检查是否是上传请求，并且 Content-Type 是 JSON 请求
        if (request instanceof HttpServletRequest)
        {
            HttpServletRequest httpRequest = (HttpServletRequest) request;

            // 如果请求是文件上传且是 multipart 请求，则直接放行
            if (httpRequest.getContentType() != null && httpRequest.getContentType().contains("multipart"))
            {
                    chain.doFilter(request, response);
                    return;
            }

            // 如果是 JSON 请求，则用 RepeatedlyRequestWrapper 包装
            if (StringUtils.startsWithIgnoreCase(httpRequest.getContentType(), MediaType.APPLICATION_JSON_VALUE))
            {
                requestWrapper = new RepeatedlyRequestWrapper(httpRequest, response);
            }
        }

        // 如果请求被包装了，使用包装的请求；否则，直接传递原始请求
        if (null == requestWrapper)
        {
            chain.doFilter(request, response);
        }
        else
        {
            chain.doFilter(requestWrapper, response);
        }
    }

    @Override
    public void destroy()
    {

    }
}
